To celebrate the meth-laced saga’s climactic end, we’ve rounded up 12 surprising behind-the-scenes facts you may not have known about the show, like: What’s Walter White’s middle name? What does “breaking bad” actually mean? And what, exactly, are those actors smoking?

Don’t worry... No spoilers ahead!

1. Just like his character Walter Jr., actor RJ Mitte has cerebral palsy. However, in real life his condition is much milder than his character's, so he had to learn to walk with a limp and crutches for the role.

2. The meth on the show is actually rock candy; when the characters are seen smoking it, they don't inhale.

4. John Cusack was the first choice to play Walter White. When he turned it down, they asked Matthew Broderick, who also declined. The role eventually went to Bryan Cranston. The casting directors were reportedly concerned about his ability to do a drama, since he was best-known for his prior comedic roles, including Malcom in the Middle.

5. "Breaking bad" is a southern American term, which means to "raise hell" or "defy authority," according to the show's creator Vince Gillian.

6. Walter's middle name is Hartwell.

7. Aaron Paul was once a contestant on The Price Is Right.

8. The character of Jesse Pinkman was supposed to be killed off by the end of the first season, but Aaron Paul’s performance was so impressive he was given a recurring role.

9. SaveWalterWhite.com is an actual website -- clicking the DONATE button brings you to the National Cancer Coalition.

10. The Guinness Book of World Records awarded Breaking Bad the record of highest-rated TV series of all time, citing a Metacritic score of 99/100.

11. Bryan Cranston was actually taught how to make meth by Drug Enforcement Administration (DEA) in preparation for his role.

12. Bob Odenkirk (Saul Goodman) read only his lines while filming the final episode. He threw out the script to make sure he wouldn't find out the ending until it airs on television.

The series finale of Breaking Bad airs on AMC this Sunday, Sept. 29 at 9 pm E.T.

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